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<p>[QUOTE=&quot;BAJJERFAN, post: 2135356, member: 74330&quot;]All that&#039;s important to most folks is that you can&#039;t see any foreign junk on the coin when you look at it. A spot-free coin vs a milk spotted one is all people care about.</p><p>The fact that there may be some adventitious contaminants doesn&#039;t really matter. Gross contaminants which are conspicuous by their presence are another matter. If you can see them they&#039;re a problem, if you can&#039;t see them they&#039;re not. It&#039;s as simple as that. The Mint also produces a lot of clean coins. Until someone provides evidence to the contrary, my take is that milkspots are due to the presence silver chloride which is an artifact of the production process.</p><p><br /></p><p>It was interesting when I was having the XPS analysis done on a spotted coin that the gentleman commented about how &quot;dirty&quot; the coin was at least in terms of stuff volatile under ultra high vacuum. It took him awhile to get it down to a suitable working vacuum.[/QUOTE]</p><p><br /></p>

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